NE format

https://habr.com/ru/articles/950798/

https://habr.com/ru/articles/950942/

MSDOS заглушка

https://retrocomputing.stackexchange.com/questions/32096/why-it-is-that-a-64-bit-exe-file-pe64-can-contain-a-custom-ms-dos-stub-a-mz-e

MSDOS EXE

https://habr.com/ru/articles/939506/